/*
 * Copyright (c) 2015 Spotify AB.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.spotify.heroic.metric;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.tdunning.math.stats.MergingDigest;
import com.tdunning.math.stats.TDigest;
import java.io.IOException;
import java.nio.ByteBuffer;


public class TdigestPointDeserialize  extends StdDeserializer<TdigestPoint> {

    protected TdigestPointDeserialize(Class<?> vc) {
        super(vc);
    }

    public TdigestPointDeserialize() {
        this(TdigestPoint.class);
    }

    @Override
    public TdigestPoint deserialize(JsonParser jsonParser,
                                    DeserializationContext ctxt)
        throws IOException, JsonProcessingException {
        JsonNode node = jsonParser.getCodec().readTree(jsonParser);
        byte[] bytes = node.get("value").binaryValue();
        TDigest tDigest = MergingDigest.fromBytes(ByteBuffer.wrap(bytes));
        long timestamp = node.get("timestamp").asLong();
        return TdigestPoint.create(tDigest, timestamp);
    }
}

